I using bind variable to do a batch update using below code
`var balanceUpdate = dslContext.batch(
dslContext.update(BALANCE)
.set(BALANCE.BALANCE, (BigDecimal) null)
.where(BALANCE.ID.eq((String) null)));
balances.forEach(balance -> {
balanceUpdate.bind(
balance.getAmount()
balance.Id);
});
int[] execute = balanceUpdate.execute();
`
Above code work well, but now i want to use bind with array of arguments like
var balanceUpdate = dslContext.batch(
dslContext.update(BALANCE)
.set(BALANCE.BALANCE, (BigDecimal) null)
.where(BALANCE.ID.eq((String) null)));
var arguments = balances.stream()
.map(balance ->
new Object[] {
balance.getAmount(),
balance.Id
}).collect(Collectors.toList());
int[] execute = balanceUpdate.bind(arguments).execute();
I get exception
java.lang.ArrayStoreException: arraycopy: element type mismatch: can not cast one of the elements of java.lang.Object[] to the type of the destination array, java.math.BigDecimal
at org.jooq_3.14.4.ORACLE12C.debug(Unknown Source)
at java.base/java.util.Arrays.copyOf(Arrays.java:3722)
at org.jooq.tools.Convert.convertArray(Convert.java:357)
at org.jooq.tools.Convert.convertArray(Convert.java:345)
at org.jooq.tools.Convert$ConvertAll.from(Convert.java:603)
at org.jooq.tools.Convert.convert0(Convert.java:392)
at org.jooq.tools.Convert.convert(Convert.java:384)
at org.jooq.tools.Convert.convert(Convert.java:458)
at org.jooq.tools.Convert.convertArray(Convert.java:363)
at org.jooq.tools.Convert.convertArray(Convert.java:345)
at org.jooq.tools.Convert$ConvertAll.from(Convert.java:614)
at org.jooq.tools.Convert.convert0(Convert.java:392)
at org.jooq.tools.Convert.convert(Convert.java:384)
at org.jooq.tools.Convert.convert(Convert.java:458)
at org.jooq.impl.AbstractDataType.convert(AbstractDataType.java:534)
at org.jooq.impl.DefaultDataType.convert(DefaultDataType.java:86)
at org.jooq.impl.DSL.val(DSL.java:24409)
at org.jooq.impl.DSL.val(DSL.java:24377)
at org.jooq.impl.Tools.field(Tools.java:1794)
at org.jooq.impl.Tools.fields(Tools.java:1865)
at org.jooq.impl.BatchSingle.executePrepared(BatchSingle.java:226)
at org.jooq.impl.BatchSingle.execute(BatchSingle.java:170)
According docs it should work ? Atleast it works without explicit casting when using jdbc. Is there anyway to get it work to sent bind variables only once instead of many times like in first example?
I think you're calling the wrong BatchBindStep.bind(Object...) method, or at least not in the way you're expecting. There's currently no overload accepting a collection of type List<Object[]>. So, what you should do instead is create an Object[][] type for your bind variable sets:
Object[][] arguments = balances
.stream()
.map(balance -> new Object[] {
balance.getAmount(),
balance.Id
}).toArray();
Related
I have following Code where i will receive list of names as parameter.In the loop, first i'm assigning index 0 value from list to local variable name. There after comparing next values from list with name. If we receive any non-equal value from list, i'm assigning value of result as 1 and failing the test case.
Below is the Array list
List<String> names= new ArrayList<String>();
names.add("John");
names.add("Mark");
Below is my selenium test method
public void test(List<String> names)
String name=null;
int a=0;
for(String value:names){
if(name==null){
System.out.println("Value is null");
name=value;
}
else if(name.equals(value)){
System.out.println("Received Same name");
name=value;
}
else{
a=1;
Assert.fail("Received different name in between");
}
}
How can i convert above code into lambda expressions?. I'm using cucumber data model, hence i receive data as list from feature file. Since i can't give clear explanation, just posted the example logic i need to convert to lambda expression.
Here's the solution: it cycles all element in your list checking if are all the same.
You can try adding or editing the list so you can have different outputs. I've written the logic, you can easly put it into a JUnit test
List<String> names= new ArrayList<>();
names.add("John");
names.add("Mark");
String firstEntry = names.get(0);
boolean allMatch = names.stream().allMatch(name -> firstEntry.equals(name));
System.out.println("All names are the same: "+allMatch);
Are you looking for duplicates, whenever you have distinct value , set a=1 and say assert to fail. You can achieve this by :
List<String> names= new ArrayList<String>();
names.add("John");
names.add("Mark");
if (names.stream().distinct().limit(2).count() > 1) {
a= 1,
Assert.fail("Received different name in between");
} else {
System.out.println("Received Same name");
}
A quick sample to understand my situation:
static Interpreter ParseInterpreter = new Interpreter();
...
var func = ParseInterpreter.Parse("ctx.SomeProp", new Parameter("ctx", typeof(???1)).Compile<Func<???2, object>>;
...
var token = JToken.Parse(s);
dynamic dToken = token;
var obj = func(dToken);
In other words, is there a way to pass some dynamic parameter to Parse method and then get a functor which accepts such parameters?
You can directly use the Lambda class returned by the Parse method, and not call the Compile function:
var interpreter = new Interpreter()
string expression = "ctx.SomeProp";
Lambda parsedExpression = interpreter.Parse(expression, new Parameter("ctx", typeof(object)));
var token = JToken.Parse(s);
var result = parsedExpression.Invoke(token);
I have not tested exactly your code but for example I have a test like this that works correctly:
dynamic dyn = new ExpandoObject();
dyn.Foo = "bar";
var interpreter = new Interpreter()
.SetVariable("dyn", (object)dyn);
Assert.AreEqual(dyn.Foo, interpreter.Eval("dyn.Foo"));
Consider that this only works on .NET 4.x, on .NET Standard/Core dynamics are not supported.
I'm using node js 0.10.12 to perform querys to postgreSQL 9.1.
I get the error error invalid input synatx for integer: "{39}" (39 is an example number) when I try to perform an update query
I cannot see what is going wrong. Any advise?
Here is my code (snippets) in the front-end
//this is global
var gid=0;
//set websockets to search - works fine
var sd = new WebSocket("ws://localhost:0000");
sd.onmessage = function (evt)
{
//get data, parse it, because there is more than one vars, pass id to gid
var received_msg = evt.data;
var packet = JSON.parse(received_msg);
var tid = packet['tid'];
gid=tid;
}
//when user clicks button, set websockets to send id and other data, to perform update query
var sa = new WebSocket("ws://localhost:0000");
sa.onopen = function(){
sa.send(JSON.stringify({
command:'typesave',
indi:gid,
name:document.getElementById("typename").value,
}));
sa.onmessage = function (evt) {
alert("Saved");
sa.close;
gid=0;//make gid 0 again, for re-use
}
And the back -end (query)
var query=client.query("UPDATE type SET t_name=$1,t_color=$2 WHERE t_id = $3 ",[name, color, indi])
query.on("row", function (row, result) {
result.addRow(row);
});
query.on("end", function (result) {
connection.send("o");
client.end();
});
Why this not work and the number does not get recognized?
Thanks in advance
As one would expect from the initial problem, your database driver is sending in an integer array of one member into a field for an integer. PostgreSQL rightly rejects the data and return an error. '{39}' in PostgreSQL terms is exactly equivalent to ARRAY[39] using an array constructor and [39] in JSON.
Now, obviously you can just change your query call to pull the first item out of the JSON array. and send that instead of the whole array, but I would be worried about what happens if things change and you get multiple values. You may want to look at separating that logic out for this data structure.
I am dynamically creating a Lambda expression (based on user input but at the moment using dummy values for a proof-of-concept) for a type which I will only know at runtime. I therefore need to pass the T portion of the Func<T,TResult> as a dynamic type, since I won't know the type until runtime (TResult will always be a bool).
It seems that I cannot pass in a Type variable or use typeof with generics. Basically I'm trying to do something like this:
// (f => f.Baz == 1)
Type theType = Type.GetType("Foo");
ParameterExpression pe = Expression.Parameter(theType, "f");
Expression left = Expression.Property(pe, theType.GetProperty("Baz"));
Expression right = Expression.Constant(1);
Expression expr = Expression.Equal(left, right);
// This works fine but uses a hard-coded type, which I won't know until runtime:
// var lambda = Expression.Lambda<Func<Foo,bool>>(expr, new ParameterExpression[] { pe }).Compile();
var lambda = Expression.Lambda<Func<theType, bool>>(expr, new ParameterExpression[] { pe }).Compile();
However, I cannot use the variable theType as the T portion of the Func. How can I fix this?
No you can't.
For example, in C#, you can't:
Type t = typeof(int);
List<t> list = new List<t>();
or
object list = new List<t>();
Unless you use reflection, but then you have to put the list in an object, and you can use it only through reflection.
So if you want you can save your Func<> in an object (or a dynamic) but nothing more.
What you COULD do is always return Func<object, bool> and cast the object to the desidered type IN the lambda function (so use a Expression.Convert(pe, theType));
Or you could use the dynamic:
// lambda == Func<Foo, bool>
dynamic lamdba = Expression.Lambda(expr, new ParameterExpression[] { pe }).Compile();
bool res = lambda(myvalue);
or
// lambda == Func<Foo, bool>
Delegate lamdba = Expression.Lambda(expr, new ParameterExpression[] { pe }).Compile();
bool res = (bool)lambda2.DynamicInvoke(t);
To be taken "not as real" some benchmarks (in StopWatch.Ticks, look at them only for proportions) (Release Mode + Start Without Debugging + some useless cycles so that they are "hot"):
236384685 dynamic
56773593 Func<object, bool> + cast
10556024247 DynamicInvoke
as a note, Func<Foo, bool> has the same speed, so there isn't any speed lost in the extra cast.
You can see the code here http://ideone.com/qhnVP3
I am using the System.Linq.Data library provided here - http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx
I have the following query which works great and returns an Iqueryable
IQueryable customer =
ctx.Customers.Where(cust => true).Select("new("Name,Address")");
However, how do I access these returned columns? I cannot access them using a lambda expression as follows:
var test = customer.Where(cust=>cust.Name == "Mike").First();
"cust.Name" in the above case cannot be resolved. It does not exist in the list of methods/properties for "cust".
Am i assuming something wrong here. I understand that I am working with an anonymous type. Do I have to create a DTO in this case?
For any IQueryable you have property called ElementType.
You can use it to get the properties as explained below
IQueryable query = from t in db.Cities
selec new
{
Id = t.Id,
CityName = t.Name
};
if(query!=null)
{
Type elementType = query.ElementType;
foreach(PropertyInfo pi in elementType.GetProperties())
{
}
}
Try foreach loop:
var a = _context.SENDERS.Select(x=>new { Address=x.ADDRESS, Company=x.COMPANY });
foreach(var obj in a)
{
Console.WriteLine(obj.Address);
Console.WriteLine(obj.Company);
}